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(No Model.) 2 Sheens-Sheet 1.

J. EVANS.

- HEATING FURNAGE.

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J. EVANS,

HEATING FURNAUE.

No. 296,399. PatentedApr. 8, 1884.

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N. PEYERa Phxuumgupnen washington. nc.

NrrnD STATES PATENT rricn.

JOHN EVANS, OF ETNA, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO GEORGE A.CHALFANT, OF SAME PLACE.

HEATING-VFUR'NACE.

SPECIFICATION formingpart of Letters Patent No. 296,399x dated-April 8,188%.

` Application 61nd June 1, 1883. (No model.)

y `T @ZZ whom it may concern.-

Be it known that I, JOHN Evans, of Etna, in the county of Allegheny andState of Penn- Sylvania, have invented a new and useful Improvenient inHeating-Furnaces; and I do hereby declare the following to be a full,clear, and exact description thereof.

My invention relates to an improvement in heating-furnaces in whichhydrocarbon gas is used as fuel; and it has for its object the perfeetcombustion of the gas, so as to generate an intense heat in theheating-chamber of the furnace, and the utilization of theA waste heatwhich passes from the heating `chamber through the ues leading to thestack, forlthe Vpurpose of heating the inflow'ing air, so thatcombustion shall taire place as soon as the air and gas meet.

I will now describe my invention, so that others skilled in the art maymanufacture and use the same, reference being had to the accompanyingdrawings, forming part of this specication, in which-u Figure l is avertical sectional view through one of the air-dues on line fw ze, Fig.2. Fig. 2 is a horizontal sectional view through the line a: rc, Figs. 1and 4. Fig. 3 is a horizontal sectional view through the line y y, Figs.l and 4. Fig. e is a vertical sectional view through one of thesmokeflues on line e z, Fig. 2. Fig. 5 is a view of the front furnace.

Like letters of reference indicate like parts wherever they occur. K

In the drawings,l a represents the air-dues, (three in. number,) whichextend from the front to the rear of the furnace under the bed. Abovethese flues a are other dues, b, which are separated from the fines abya partitionwall, c, excepting at the rear end, wherethey communicatewith the lues a through the openings d.

At the forward end of the iue b is a vertical iiue or chamber, c,between the bridgewall f and the closed front of the furnace. 45 Behindthe bridge-wall is the heating-chamber h, and at the rear end of theheating-chamber are four openings, i, leading into the smoke-dues k,which extend on both sides of and between the air-dues b forward to the5o front wall of the furnace.

Below the smolreflues Z: are other smokedues, l, which are separatedfrom the flues it by a partition-wall, c, excepting at the front end ofthe furnace, where they communicate with theilueskthrough theopenings-m. These dues Z extend to the rear end of the furnace on eachside of and between the air-dues u, where they discharge into thelateral ue ln., which communicates with the stack o.

Set in the front wall of the furnace-and ex.` oo tending across thesame, is a gas-pipe, p, having openings providedA with branch pipes p,which discharge through the front wall into the vertical air due orchamber e at or near Ithe level of the top of the bridge-wall f. 6 5

ing from the heating-chamber through the openings t and flues 7a and Z,heat the partitionwalls between the smoke-nues and air-nues, and therebythe temperature of the air which passes through the air-dues a b .israised to a 8o high degree before it enters the heating-chamber.

The advantages of my invention consist in preventing the gas from comingin contact with any but thoroughlyheated air by exclud- Aing theentrance of any air except through the air-heating fines, the thoroughmingling of the air and gas in a special chamber in front of the bridge,and the utilization ofthe waste heat of the furuaceto bring the air tocondi- 9o tion for proper union with the hydrocarbon Vhat I claim as myinvention, and desire to secureby Letters Patent, is

1. In a heatingfurnace, the combination of the following elements, viz:return air-fines extending under the bed, and having the receivinganddelivery ports at the front end of the furnace, a vertical chamber infront of the bridge-wall communicating with the air-fines, waste orsmoke dues extending forward under the bed, and. then back to the stackat the IOO sides of the air-fines, and having the receiving l anddelivery ports at the rear end of the furnace, said air andWaste-product iiues being arranged alternately and in vertical planes, 5and a gas-main having branches Which discharge the gas into the verticalair-chamber at or near the bridge-Wall, substantially as and for thepurposes described.

2. In combination with the bed of a heatingfurnace, aregenerator-chamber arranged beneath the same, said chamber composed ofa series of air and Waste product flues constructed in the form ofreturn-nues, as specified, the air-fines having their receiving and r 5delivery ports at the front of the furnace, the

wasteproduct lues having their receiving and discharge ports at theopposite or rear end of the furnace, and the air and Waste-product luesarranged parallel and alternating, Whereby the air and Waste productstravel in re- 2o verse direction, and the air travels progressively fromthe coolest to the hottest part of the furnace, substantially asspecified.

In testimony whereof I have hereunto set my hand this 31st day of May,A. D. 1883.

JOHN EVANS.

Witnesses;

W. B. GORWIN, T. B. KEER.

